Final answer:
The effectiveness of a reinforcer depends on the frequency of unconditioned reinforcement correlated with it.
Step-by-step explanation:
The effectiveness of a reinforcer depends on the frequency of unconditioned reinforcement correlated with it. A reinforcer is a stimulus or event that increases the likelihood of a target behavior occurring again in the future. It can be positive, such as providing a reward, or negative, such as removing an aversive stimulus. The frequency of unconditioned reinforcement, which is the natural reward associated with a behavior, plays a crucial role in determining the effectiveness of the reinforcer. The more frequently the unconditioned reinforcement is associated with a particular reinforcer, the more effective that reinforcer is likely to be in influencing behavior.